# GPT-5.4

OpenAI's most capable reasoning model with massive 1.05M context window.

## Overview

- **Provider:** OpenAI
- **Model ID:** `gpt-5.4`
- **Type:** Chat
- **Canonical URL:** https://modelstack.cc/models/chat/gpt-5.4
- **Version:** v5.4
- **Best for:** Extended reasoning, complex problem-solving, highest intelligence tasks

## Pricing

| Usage | Price |
| --- | ---: |
| Input | $2.5 / 1M tokens |
| Output | $15 / 1M tokens |
| Cache read | $0.25 / 1M tokens |
| Cache write (5 minutes) | $2.5 / 1M tokens |

## Specifications

- **Context window:** 1.05M
- **Maximum output:** 128K
- **Typical latency:** 18 ms
- **Released:** 2026-03

## Capabilities

- chat
- tool_use
- vision
- coding

## API usage

Use this model ID in a ModelStack API request:

```json
{
  "model": "gpt-5.4"
}
```

For the rendered page, visit https://modelstack.cc/models/chat/gpt-5.4.